/*
 * FreeRTOS Kernel V10.0.0
 * Copyright (C) 2017 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software. If you wish to use our Amazon
 * FreeRTOS name, please do so in a fair use way that does not cause confusion.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * http://www.FreeRTOS.org
 * http://aws.amazon.com/freertos
 *
 * 1 tab == 4 spaces!
 */

/* FreeRTOS includes. */
#include "FreeRTOS.h"
#include "task.h"

/* Library includes. */
#include "definitions.h"

/*
 * The FreeRTOS tick handler.  This function must be installed as the handler
 * for the timer used to generate the tick interrupt.  Note that the interrupt
 * generated by the PIT is shared by other system peripherals, so if the PIT is
 * used for Tick generation then FreeRTOS_Tick_Handler() can only be installed
 * directly as the PIT handler if no other system interrupts need to be
 * serviced.  If system interrupts other than the PIT need to be serviced then
 * install System_Handler() as the PIT interrupt handler in place of
 * FreeRTOS_Tick_Handler() and add additional interrupt processing into the
 * implementation of System_Handler().
 */

static void System_Handler( void );

/*-----------------------------------------------------------*/

static void System_Handler( void )
{
    /* See the comments above the function prototype in this file. */
    FreeRTOS_Tick_Handler();
}
/*-----------------------------------------------------------*/

/*
 * The application must provide a function that configures a peripheral to
 * create the FreeRTOS tick interrupt, then define configSETUP_TICK_INTERRUPT()
 * in FreeRTOSConfig.h to call the function.  This file contains a function
 * that is suitable for use on the Atmel SAMA5.
 */
void vConfigureTickInterrupt( void )
{
    /* NOTE:  The PIT interrupt is cleared by the configCLEAR_TICK_INTERRUPT()
    macro in FreeRTOSConfig.h. */


    /* Initialize the PIT to the desired frequency - specified in PIT ticks. */
    PIT_TimerPeriodSet( PIT_TimerFrequencyGet() / configTICK_RATE_HZ );
    PIT_TimerStart();

    /* Prevent compiler warnings in the case where System_Handler() is not used
    as the handler.  See the comments above the System_Handler() function
    prototype at the top of this file. */
    ( void ) System_Handler;
}
/*-----------------------------------------------------------*/

/* The function called by the RTOS port layer after it has managed interrupt
entry. */
void vApplicationIRQHandler( void )
{

    typedef void (*ISRFunction_t)( void );
    ISRFunction_t pxISRFunction;

    /* Obtain the address of the interrupt handler from the AIR. */
    pxISRFunction = ( ISRFunction_t ) AIC_REGS->AIC_IVR;

    /* Write back to the SAMA5's interrupt controller's IVR register in case the
    CPU is in protect mode.  If the interrupt controller is not in protect mode
    then this write is not necessary. */
    //AIC->AIC_IVR = ( uint32_t ) pxISRFunction;

    /* Ensure the write takes before re-enabling interrupts. */
    __DSB();
    __ISB();
    __enable_irq();

    /* Call the installed ISR. */
    pxISRFunction();
}

void vClear_Tick_Interrupt(void)
{
    PIT_ClearInterrupt();
    return;
}
